Scythe, straw knife, and the like



March 29, 1932. GQNYK 1,851,829

SCYTHE, STR'AW KNIFE, AND THE LIKE Filed Dec. 1, 1928 2 Sheets-Sheet 1Fig.1

March 29, 1932. GONYK 1,851,829

SCYTHE, STRAW KNIFE, AND THE LIKE Filed Dec. 1, 1928 g Sheets-Sheet 2Fig.6

40 N I W a a 1 Patented Mar. 29,1932

IGNATZ GON'YK, F

PATENT VIENNA, aus'rnra OFFICE,

SCYTHE, STRAW KNIF AND E LIKE Application filed December 1, 1928, SerialNo.

The invention relates to scythes, straw knives and the like and morespecially to Scythes of the kind described in Patent N 0. 1,628,589, inwhich an interchangeable steel cutting blade or strip is arranged on ablunt main scythe blade by means of a special fastening rail, said railbeing rigidly connected with said steel blade, whereby it is possible toutilize relatively thin strips by pressing i together the scythe bladewith the interchangeable blade and the rail.

To avoid a weight exceeding that of an ordinary scythe without impairingthe required rigidity of the strip, the latter has to be very thin andshould offer sufficient resistance against bending. The rail also has tobe made of thin material in order to avoid excessive weight. These partsshould offer a certain degree of stiffness and this is effected I bytightly fastening them on the main blade,

the increase of Weight due to the fastening means thus being only verysmall.

The object of the invention is a further development of a scythe of thekind described and an improved connection of its parts, fulfilling theaforesaid requirement, and in which the fastening of the three parts ofthe scythe, i. e. the main blade, the cutting strip and the fasteningrail, is effected by wedging them together without any remarkableincrease of weight.

Several modifications of thescythe forming the object of the presentinvention are illustrated in the accompanying drawings wherein,

Figure 1 is the main blade of the scythe; Fig. 2 the fastening rail;Fig. 3 the steel cutting blade; Fig. 4c the assembled scythe; Fig. 5 isa section along line AB of Fig. on an enlarged scale; Fig. 6 is the samesection of a modification; Fig. 7 is a view of a further modification ofthe fastening rail;

Fig. 8 is a section on line CD of Fig. 7; Fig. 9 is an assembled view ofthe structures shown in Figs. 6 and 7 Fig. 10 is a modification of thefastening rail seen from above in the position shown in Fig. 11; and

322,991, and in Germany December 2, 1927;

Fig. 11 shows this fastening rail assembled H vided in which bridges 2enter, so that the steel cutting strip lies flat on the surface of themain blade. The fastening rail 5 is provided with apertures 6 of largersize in the longitudinal direction than the U-shaped bridges 2'projecting from the plain blade. 1 The fastening. rail 5 is laid flatupon the blade 3. In order to fasten the blades 1 and 3 together theapertures 6 of the rail '5 are provided with tongues 7 which, byshifting the rail 5 towards the end of the blade 1, enter below theU-shaped bridges. These tongues 7 are tapered, whereby the blade 3 maybe pressed against the main blade 1, the

assembled parts fastening rail, main blade and cutting blade) thenforming a unit.

In order to obtain a tight connection of these parts the longitudinaltongues 7 are tapered towards the outer end of the scythe and thebridges 2 are correspondingly tapered in the same direction. By shiftingthe rail towards the outer end of the scythe the three parts of thescythe 1, 3, 5 are pressed tightly together. In order to facilitateshifting by hand and to prevent parts of vegetable matter or the-likebeing caught, the. fastening rail i'sprovided at. the larger scythe endwith main blade 1 .(Fig. 6), the other featuresof the three parts of thescythe being the same as in the modification shown in Figs. 1 to 5.

In the modification according to Figs. 7 to 9 the fastening rail 5 isprovided, above the apertures 6 and corresponding longitudinal tongues7, with a pocket 11 open only at one side opposite to the tongues andserving as a guide along the bridges 2 or along the guides 10respectively, in inserting the rail 5 and at the same time preventingvegetable matte from intruding into the apertures.

As in certain scythes when interchanging the blades it is inconvenientto put the fastening rail on in its correct position so that the pocketswill overlap the U-shaped bridges. In the modification according toFigs. 10 and 11 a pocket 12 open at the top is provided which permitsinsertion of rail 5 from below transversely over said bri ges.

In testimony that I claim the foregoing as my invention,

by a transverse and a subsequent longitudiv nal shifting movement. Theupper opening of this pocket passes over the U-shaped bridges 2 or theguides 10 (Fig. 6) respectively until correct position for engagement ofthe parts is obtained by longitudinal shifting of the rail.

I claim- 1. A device of the character described including a main blade,a series of U-shaped bridges carried thereby, a cutting blade engageablewith the bridges, a fastening strip having apertures to receive thebridges, and

a lateral tongue in each aperture adapted to 7 enter between the bridgesand surface of the cutting blade to lock the parts together.

2. A device of the character described, including a main blade, a seriesof U-shaped bridges carried thereby having beveled bearing surfaces, acutting blade engageable with the bridges, a fastening strip havingapertures to receive the bridges and a tapered tongue in each apertureadapted to engage the beveled surfaces of the bridge and thereby exert awedging action on the cutting blade.

3'. A device of the character described including a main blade, a seriesof U-shaped bridges carried thereby, a cutting blade engageable with thebridges, a fastening strip having apertures to receive the bridges, anda lateral tongue in each aperture adapted to enter between the bridgesand surface of the cutting blade to lock the parts together, and pocketson the fastening strip to partly cover said apertures and forming guidesfor said bridges. l r

4. A device of the character described including a main blade, a seriesof U-shaped bridges carried thereby, a cutting blade engageable with thebridges, a fastening strip having apertures to receive the bridges, anda lateral tongue in each aperture adapted to enter between the bridgesand surface of the cutting blade to lock the parts together, and pocketson the fastening strips adapted to partly cover the apertures and openon one I have signed my name.

IGNATZ GONYK.

